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The increasing demand for meat and meat products brings trouble not only to the natural resources under our feet but also to those overhead in the atmosphere. Even though carbon dioxide is a major cause of global warming in the air, recent research has shown that methane can have a greater impact.

Methane is responsible for about 16 percent of global greenhouse gas emissions. That doesn’t seem like much, but experts warn that methane is over 20 times as powerful as carbon dioxide in trapping the sun’s heat in the atmosphere. Where does all the methane come from?

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Much of the methane in the atmosphere is released naturally in damp areas. However, about 15 percent is emitted by the growing number of cows and pigs. Statistics vary about the exact amount of methane emitted by a cow, but it is generally agreed that a single cow releases up to 120 kilograms of methane per year, more than any other domestic animal. That is about 1,000 times the amount of methane emitted by an average person.